Calculating solar terahertz radiation fluxes recorded by scientific instrumentation detectors onboard the international space station

The paper provides a brief description of objectives and tasks of the upcoming space experiment Sun-Terahertz onboard the Russian Segment of the International Space Station. The experiment aims to study the solar radiation in the unexplored terahertz range at frequencies of 1012...1013 Hz, obtaining new data on solar terahertz radiation, solar active regions and solar flares. Scientific instrumentation that is being developed consists of eight detectors that are sensitive to emissions of different frequencies: 0.4, 0.8, 1.0, 3.0, 5.0, 7.0, 10.0 and 12.0 THz. The paper discusses key components of the detectors: a telescope, a system of filters, an optical shutter and a receiver. It provides a spectral transmissivity analysis for filter systems in each channel and their bandwidth. The sensitivity estimates for the eight detectors within the instrument were verified using a blackbody simulator.